Cary- Have you checked the player's manual? All players have the ability to set the levels of their 5.1 analog outputs.

Also, the difference you are hearing is too large to be caused by phase. You need to turn down the sub's level in the player.

Be careful, because there are multiple menus in the player. You have to find the right menu.
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KevinVision 7.1 ... New and Improved !!